Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9ee9b9c0738339…

MALICIOUS

PDF

73.9 KB Created: 2021-05-31 16:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e81ac53e4d25783b6f5390981c001016 SHA-1: 4c7f62a9ba993710aa75b0d5be2b382e33cdda63 SHA-256: fe9ee9b9c0738339d50d4c240e5c0c481826b152d4beb97b9c642fffad576b51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing or malware distribution lure, masquerading as a worksheet answer key. It contains a mass of external links, with the primary URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the redirection of users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/pbw?utm_term=worksheet+interrogatives+spanish+answer+key
    • https://folatidaxewurel.weebly.com/uploads/1/3/4/3/134317863/7602210.pdf
    • https://panujiwawavila.weebly.com/uploads/1/3/4/4/134457592/gabemowinurawis-nodewu.pdf
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/laliwu-xajefisagewata.pdf
    • https://static.s123-cdn-static.com/uploads/4417314/normal_5fdef7d6a7da1.pdf
    • https://cdn-cms.f-static.net/uploads/4417429/normal_601577c87c8ff.pdf
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/rabugawexidu_zunitemitadaw_taxujo_jovivinim.pdf
    • https://cdn-cms.f-static.net/uploads/4384167/normal_605a0545709bd.pdf
    • https://cdn-cms.f-static.net/uploads/4486220/normal_60223f384d551.pdf
    • https://medowiwufaj.weebly.com/uploads/1/3/4/4/134480571/zenagenegarer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lekuzax.pbworks.com/w/file/fetch/144411894/gubusugaje.pdf
    • http://visetululiv.pbworks.com/w/file/fetch/144413754/simple_explanation_of_delegatus_non_potest_delegare.pdf
    • https://uploads.strikinglycdn.com/files/9150aa54-1fb9-4e4d-bc05-d5c7b1fef48f/jump_rope_mat_walmart.pdf
    • https://uploads.strikinglycdn.com/files/5bd33f57-c135-427e-adca-61d0ef77ebbd/68719086400.pdf
    • https://uploads.strikinglycdn.com/files/5026ea63-0584-472c-bb2f-a0f8a4a3dd0b/44373192775.pdf
    • https://uploads.strikinglycdn.com/files/23e402a2-0988-4276-9c29-f591de81aa3b/adverb_exercises_for_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/54ad05d1-18f4-4ff6-a872-ab802dec9675/qu_es_el_cianuro_en_qumica.pdf
    • https://uploads.strikinglycdn.com/files/657424ca-7348-49e9-99d3-4d9c0a68a431/nilibuwisasuninotejof.pdf
    • http://nusuwoxub.pbworks.com/f/josepadekanawuxuzamigewi.pdf
    • https://uploads.strikinglycdn.com/files/817f5e76-617f-4128-9d6b-da3807420bdc/the_alienist_2_uscita_netflix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e377.bin
385ce899e6b851665c09faaac293882975e888f0ad34a7079b2ae0c05a8a2e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 5380 bytes
font_01_sfnt_off0000f5e2.bin
098fac15dab173362eba495d1dc226e32107c4e273371b860a4209dcb1b3f976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 11068 bytes

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